·adj Contaminating with illegality; exposing to seizure and forfeiture.
II. Infectious ·adj Corrupting, or tending to corrupt or contaminate; vitiating; demoralizing.
III. Infectious ·adj Capable of being easily diffused or spread; sympathetic; readily communicated; as, infectious mirth.
IV. Infectious ·adj Having qualities that may infect; communicable or caused by infection; pestilential; epidemic; as, an infectious fever; infectious clothing; infectious air; infectious vices.